EP1351830A1 - Directional running tread comprising sipes with variable inclination - Google Patents

Directional running tread comprising sipes with variable inclination

Info

Publication number
EP1351830A1
EP1351830A1 EP01984837A EP01984837A EP1351830A1 EP 1351830 A1 EP1351830 A1 EP 1351830A1 EP 01984837 A EP01984837 A EP 01984837A EP 01984837 A EP01984837 A EP 01984837A EP 1351830 A1 EP1351830 A1 EP 1351830A1
Authority
EP
European Patent Office
Prior art keywords
incisions
tread
ribs
strip
inclination
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01984837A
Other languages
German (de)
French (fr)
Other versions
EP1351830B1 (en
Inventor
Robert Radulescu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
Original Assignee
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Michelin Recherche et Technique SA Switzerland, Michelin Recherche et Technique SA France, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
Publication of EP1351830A1 publication Critical patent/EP1351830A1/en
Application granted granted Critical
Publication of EP1351830B1 publication Critical patent/EP1351830B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B60C11/0309—Patterns comprising block rows or discontinuous ribs further characterised by the groove cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C11/124—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern inclined with regard to a plane normal to the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/001—Tyres requiring an asymmetric or a special mounting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S152/00—Resilient tires and wheels
    • Y10S152/03—Slits in threads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S152/00—Resilient tires and wheels
    • Y10S152/901—Tread pattern having no blocks and having circumferential ribs defined by linear circumferential grooves having straight edges

Definitions

  • the present invention relates to tire treads intended to equip the front axle of transport vehicles and more particularly of heavy goods vehicles, capable of making long journeys at sustained speed.
  • These tires comprise a carcass reinforcement comprising a plurality of reinforcements arranged radially, this carcass reinforcement itself being surmounted by a crown reinforcement extending in the circumferential direction.
  • This crown reinforcement is composed of at least two plies superimposed on each other, each ply being formed from a rubber mixture reinforced by a plurality of cables or wires which are not very extensible, preferably of steel, arranged parallel to one another in the same sheet and in a direction making an angle at most equal to 40 °, the cables from one sheet to the other being crossed between them.
  • This crown reinforcement can be completed, on the one hand by two half plies formed of cables which are not very extensible making with the circumferential direction an angle comprised between 45 ° and 80 °, on the other hand by at least one ply formed of cables called " elastic bands "placed radially outside the crown plies whose reinforcing cables make an angle of less than 40 °.
  • the crown reinforcement is also surmounted on its radially outer surface by a tread produced with at least one rubber mixture, the part of which radially outside the tire forms the tread surface intended to come into contact with the roadway during the rolling of said tire.
  • this tread is provided on its outer surface, in the case of tires intended for the equipment of the front axle steering of heavy goods vehicles, a plurality of grooves of general circumferential orientation.
  • These grooves form a sculpture comprising a plurality of ribs, each rib having a contact face radially on the outside and side walls which can be substantially perpendicular to the contact face of the rib or can make a non-zero draft angle with this face.
  • transverse cutouts and the longitudinal grooves define a plurality of eraser patterns having during driving a leading edge or edge, that is to say an edge coming into contact with the roadway before the rest of the contact surface of said pattern, and a trailing edge.
  • a leading edge or edge that is to say an edge coming into contact with the roadway before the rest of the contact surface of said pattern, and a trailing edge.
  • a sculpture comprising circumferential grooves so as to provide the tread with at least five ribs, at least the ribs delimited by two circumferential grooves being provided with incisions of width less than 3 mm, transverse and substantially parallel to each other, these incisions being inclined at an angle between 5 ° and 25 ° relative to a direction perpendicular to the running surface of the tread so that the resulting force exerted, when rolling in the area contact with the ground, by the ground on the tread tends to straighten the incisions towards a zero inclination relative to said perpendicular direction.
  • wear life of the tread is reduced compared to that of a tire whose tread is not provided with inclined incisions.
  • the term wear life means the possible duration of use before complete wear of a tread of a tire while driving, leading either to a tire change or to the renewal of the tread by retreading.
  • a tread for a tire intended to equip the front axle of a heavy goods vehicle comprising a radial carcass reinforcement surmounted by a crown reinforcement, this strip comprising grooves of general circumferential orientation delimiting at least three ribs, two of said ribs forming the edges of the strip, some of the intermediate ribs (that is to say located between the edge ribs) being provided with a plurality of width incisions less than 3 mm, of depth E and of general transverse orientation and substantially parallel to each other, these incisions having a non-zero average inclination relative to the direction perpendicular to the running surface of the strip in the new state so that the resulting force exerted in rolling in the zone of contact with the roadway by said roadway on the strip tends to straighten the incisions towards a zero mean inclination with respect to this perpendicular, this strip being characterized in that, seen in a cutting plane perpendicular to the axis of rotation of the tire: each incision formed on
  • a point of an incision located inside the strip is said in front of the point of the incision on the rolling surface in new condition when it is necessary to rotate, in the direction of travel recommended, a radial plane (plane containing the axis of rotation of the tire) passing through the point of the incision on the rolling surface in new condition to bring it to the point of the incision inside the strip.
  • An angle close to or equal to 0 ° with a perpendicular means an angle at most equal to 5 ° (this angle can be either positive or negative).
  • the average inclination of an incision is given by the angle made by the direction connecting a point of the incision on the running surface of the strip and the innermost point of the strip taken in the same plane. cutting perpendicular to the axis of rotation.
  • each tire comprises a visible means indicating the preferred direction of travel.
  • the upper inclination of the incisions after partial wear of the strip leads to maintaining the differential of resulting average forces between the intermediate ribs provided with inclined incisions and the edge ribs without incision, which is particularly favorable after partial wear of the strip to avoid penalizing the ribs edge in wear.
  • the incisions with variable inclination in the depth are arranged on at least one of the intermediate ribs and at an average pitch p such that the ratio k,
  • Se is the sum of the surfaces of the ribs provided with incisions with variable inclination in the thickness according to the invention, and H the average depth of the longitudinal grooves.
  • H the average depth of the longitudinal grooves.
  • the incisions have depths E close to the depths H of the longitudinal grooves so as to protect the entire height of the edge ribs.
  • the incisions with variable inclination check the following values: - Average inclination between 5 ° and 15 °;
  • Tilt at the end 5 ° to 25 °.
  • the incisions with variable inclination can present a variation of regular and progressive inclination or else a variation according to any other form (for example linear by pieces).
  • Figure 1 plan view of part of a tread of a heavy vehicle according to the invention
  • Figure 2 shows a sectional view along line II-II of the strip shown in Figure 1;
  • Figure 3 shows a sectional view along line HI-III of the strip shown in Figure 1.
  • This tread 1 has three main grooves 2 oriented circumferentially, these three grooves having a depth H of 18 mm. These grooves 2 delimit three intermediate ribs 31, 32, 33 and two edge ribs 30, 34, each edge rib axially limiting the area of contact of the tread with the roadway during the rolling of the tire.
  • the intermediate ribs positioned between the edge ribs are provided with a plurality of incisions 41, 42, 43 of variable inclination in the thickness of the strip and passing through each side of said intermediate ribs.
  • These incisions have, on the rolling surface S, a V-shaped trace whose tip is directed in the preferred direction of rotation (indicated by the arrow R) of the tire provided with this tread.
  • the average pitch p between the incisions of variable inclination in the thickness of the strip is, in the case presented, constant for each rib, but it could be different depending on the
  • FIG 2 there is shown a section of the intermediate rib 31 located near the edge rib 30, this section being made along the line II-II of Figure 1 in a plane pe ⁇ endicular to the axis of rotation of the tire.
  • this section there are incisions 41 of total depth E slightly less than the depth ⁇ of inclination grooves variable in thickness and having a curvilinear shape whose average inclination is equal to 7 ° (the average inclination of the incision being equal to the angle ⁇ made, with a perpendicular D to the rolling surface at point A of intersection of this incision with the rolling surface, the straight line D 'situated in the cutting plane and passing through point A of intersection of this incision with the rolling surface and point B the most inside of the same incision).
  • the angle ⁇ which, in the plane of Figure 2, makes the tangent T to the line of the incision at point A on the rolling surface in new condition with the perpendicular D to the rolling surface at the same point A, is zero in the example described; this angle increases gradually and regularly with depth to reach 10 ° at the innermost point B of the tread (this point B being located at a distance E from the running surface in new condition).
  • FIG 3 is shown a section along line III-III of the central rib 32 of the tread 1 shown in Figure 1.
  • This central rib comprises a plurality of incisions 42 distributed regularly in the circumferential direction with a step 38 mm, each of said incisions having, in section view, a succession of three straight lines, the total depth E of these incisions being slightly less than the depth H of each groove 2 (this last depth H being equal to the height of the rib 32).
  • the first trace 421 is perpendicular to the rolling surface at the point Al of intersection of the incision with the rolling surface and extends over a depth substantially equal to one third of the height H of the central rib 32.
  • the second trace rectilinear 422 forms an angle ot2 equal to 5 ° with the first trace 421 and extends it over approximately a third of the height of the rib.
  • the last rectilinear line 423 forms an angle ⁇ 3 equal to 5 ° with the second line 422 and extends it over about a third of the height of the rib to the point Bl of the end of the incision.
  • the intermediate ribs located directly in the vicinity of the edge ribs may further include a plurality of incisions opening only on their edge located on the side of said edge ribs; these incisions having, as known, the function of protecting the intermediate ribs from irregular wear affecting the longitudinal edges of said ribs.
  • These latter incisions can follow the same profile as the incisions of variable inclination in the thickness and also be of variable inclination.
  • incisions of shallow depth in front of the depth of the grooves can be made: these incisions, of depth between a few tenths of a millimeter to two millimeters only play a role when the tread is new before disappearing after wear in the very first kilometers of driving and does not in any way modify the rigidities of the tread pattern.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Closing Of Containers (AREA)
  • Tubes (AREA)
  • Cartons (AREA)

Abstract

A tread ( 1 ) for steer axle tires for a heavy vehicle, the tire having a preferred direction of travel, the tread comprising grooves ( 2 ) of generally circumferential orientation defining at least three ribs ( 30, 31, 32, 33, 34 ), two of the ribs forming the edges ( 30, 34 ) of the tread, some of the intermediate ribs ( 31, 32, 33 ) being provided with a plurality of incisions ( 41, 42, 43 ), of general transverse orientation and substantially parallel to each other, the incisions having an average inclination other than zero relative to the direction perpendicular to the running surface of a new tread, this tread being characterised in that, when viewed in a section plane perpendicular to the axis of rotation of the tyre, the incisions in the intermediate ribs form, on and in the vicinity of the running surface when new of the tread, an angle close to or equal to 0° with a line perpendicular to said surface at the point of intersection, whereas the angle of each of these incisions increases in the depth of the tread.

Description

BANDE DE ROULEMENT DIRECTIONNELLE PRESENTANT DES INCISIONS D'INCLINAISON VARIABLE. DIRECTIONAL TREAD HAVING VARIABLE INCLINATION INCISIONS.
La présente invention se rapporte aux bandes de roulement pour pneumatiques destinés à équiper l'essieu avant des véhicules de transport et plus particulièrement des véhicules poids lourd, susceptibles d'effectuer de longs trajets à vitesse soutenue.The present invention relates to tire treads intended to equip the front axle of transport vehicles and more particularly of heavy goods vehicles, capable of making long journeys at sustained speed.
Ces pneumatiques comportent une armature de carcasse comprenant une pluralité de renforts disposés radialement, cette armature de carcasse étant elle-même surmontée d'une armature de sommet s'étendant dans la direction circonférentielle. Cette armature de sommet est composée d'au moins deux nappes superposées les unes sur les autres, chaque nappe étant formée de mélange de gomme renforcé par une pluralité de câbles ou fils peu extensibles, de préférence en acier, disposés parallèlement les uns aux autres dans une même nappe et suivant une direction faisant un angle au plus égal à 40°, les câbles d'une nappe à l'autre étant croisés entre eux. Cette armature de sommet peut être complétée, d'une part par deux demi nappes formées de câbles peu extensibles faisant avec la direction circonférentielle un angle compris entre 45° et 80°, d'autre part par au moins une nappe formées de câbles dits "élastiques" placés radialement à l'extérieur des nappes de sommet dont les câbles de renfort font un angle inférieur à 40°.These tires comprise a carcass reinforcement comprising a plurality of reinforcements arranged radially, this carcass reinforcement itself being surmounted by a crown reinforcement extending in the circumferential direction. This crown reinforcement is composed of at least two plies superimposed on each other, each ply being formed from a rubber mixture reinforced by a plurality of cables or wires which are not very extensible, preferably of steel, arranged parallel to one another in the same sheet and in a direction making an angle at most equal to 40 °, the cables from one sheet to the other being crossed between them. This crown reinforcement can be completed, on the one hand by two half plies formed of cables which are not very extensible making with the circumferential direction an angle comprised between 45 ° and 80 °, on the other hand by at least one ply formed of cables called " elastic bands "placed radially outside the crown plies whose reinforcing cables make an angle of less than 40 °.
L'armature de sommet est par ailleurs surmontée sur sa surface radialement extérieure d'une bande de roulement réalisée avec au moins un mélange de caoutchouc dont la partie radialement à l'extérieur du pneumatique forme la surface de roulement destinée à venir en contact avec la chaussée pendant le roulage dudit pneumatique.The crown reinforcement is also surmounted on its radially outer surface by a tread produced with at least one rubber mixture, the part of which radially outside the tire forms the tread surface intended to come into contact with the roadway during the rolling of said tire.
Pour obtenir une performance d'adhérence satisfaisante en roulage sur une chaussée recouverte d'eau, cette bande de roulement est pourvue sur sa surface extérieure, dans le cas de pneumatiques destinés à l'équipement de l'essieu avant directeur de véhicules poids lourd, d'une pluralité de rainures d'orientation générale circonférentielle. Ces rainures forment une sculpture comportant une pluralité de nervures, chaque nervure ayant une face de contact radialement à l'extérieur et des parois latérales pouvant être sensiblement perpendiculaires à la face de contact de la nervure ou bien pouvant faire un angle de dépouille non nul avec cette face. Pour améliorer encore l'adhérence, il est connu de pourvoir certaines des nervures avec une pluralité de rainures et/ou d'incisions d'orientation transversale. Ces découpures transversales et les rainures longitudinales délimitent une pluralité de motif de gomme présentant au cours du roulage un bord ou arête d'attaque, c'est-à-dire un bord venant en contact avec la chaussée avant le reste de la surface de contact dudit motif, et un bord de fuite. On a pu constater l'apparition d'une usure dite "irrégulière" car se développant sur la surface de contact de ces motifs au voisinage du bord de fuite pendant le roulage du pneumatique pourvu de cette bande de roulement.To obtain a satisfactory grip performance when driving on a road surface covered with water, this tread is provided on its outer surface, in the case of tires intended for the equipment of the front axle steering of heavy goods vehicles, a plurality of grooves of general circumferential orientation. These grooves form a sculpture comprising a plurality of ribs, each rib having a contact face radially on the outside and side walls which can be substantially perpendicular to the contact face of the rib or can make a non-zero draft angle with this face. To further improve adhesion, it is known to provide some of the ribs with a plurality of grooves and / or incisions of transverse orientation. These transverse cutouts and the longitudinal grooves define a plurality of eraser patterns having during driving a leading edge or edge, that is to say an edge coming into contact with the roadway before the rest of the contact surface of said pattern, and a trailing edge. We have seen the appearance of so-called "irregular" wear as it develops on the contact surface of these patterns in the vicinity of the trailing edge during the running of the tire provided with this tread.
Pour améliorer la résistance à cette usure irrégulière de cette bande en réduisant la tendance à une usure irrégulière sur les surfaces situées près des bords de fuite la demanderesse a proposé une nouvelle sculpture décrite dans le brevet européen EP 0384182.To improve the resistance to this irregular wear of this strip by reducing the tendency to an irregular wear on the surfaces located near the trailing edges the applicant has proposed a new sculpture described in European patent EP 0384182.
Selon ce document, il est proposé une sculpture comprenant des rainures circonférentielles de façon à munir la bande de roulement d'au moins cinq nervures, au moins les nervures délimitées par deux rainures circonférentielles étant munies d'incisions de largeur inférieure à 3 mm, transversales et sensiblement parallèles entre elles, ces incisions étant inclinées d'un angle compris entre 5° et 25° par rapport à une direction perpendiculaire à la surface de roulement de la bande de roulement de sorte que la force résultante exercée, en roulage dans la zone de contact avec le sol, par le sol sur la bande de roulement tende à redresser les incisions vers une inclinaison nulle par rapport à ladite direction perpendiculaire.According to this document, a sculpture is proposed comprising circumferential grooves so as to provide the tread with at least five ribs, at least the ribs delimited by two circumferential grooves being provided with incisions of width less than 3 mm, transverse and substantially parallel to each other, these incisions being inclined at an angle between 5 ° and 25 ° relative to a direction perpendicular to the running surface of the tread so that the resulting force exerted, when rolling in the area contact with the ground, by the ground on the tread tends to straighten the incisions towards a zero inclination relative to said perpendicular direction.
Si cette disposition permet effectivement de lutter contre ce type d'usure irrégulière, on constate que l'usure moyenne globale des nervures bord est très sensiblement augmentée par rapport à l'usure globale moyenne des nervures intermédiaires. Cette différence d'usure est, après un certain kilométrage parcouru, la cause d'apparition d'une usure irrégulière dite "en rail" sur les bords longitudinaux des nervures bord; cette usure est liée au développement de contraintes freineuses exercées par la chaussée sur ces nervures bord résultant des différences de longueurs parcourues par les nervures bord et les nervures intermédiaires.If this arrangement effectively makes it possible to combat this type of irregular wear, it can be seen that the overall average wear of the edge ribs is very significantly increased compared to the average overall wear of the intermediate ribs. This difference in wear is, after a certain mileage traveled, the cause of the appearance of irregular wear called "rail" on the longitudinal edges of the edge ribs; this wear is linked to the development of braking stresses exerted by the roadway on these edge ribs resulting from the differences in length traveled by the edge ribs and the intermediate ribs.
Pour simplifier, l'usure devient plus régulière mais la durée de vie en usure de la bande de roulement est diminuée par rapport à celle d'un pneumatique dont la bande de roulement n'est pas pourvu d'incisions inclinées. Par durée de vie sur usure, on entend la durée d'utilisation possible avant usure complète d'une bande de roulement d'un pneumatique en roulage conduisant soit au changement de pneumatique soit au renouvellement de la bande de roulement par rechapage. II existe donc un besoin d'une sculpture pour pneumatiques destinés à équiper l'essieu avant des véhicules poids lourd qui ne présente pas (ou peu) d'usure irrégulière et sensiblement une même vitesse d'usure pour toutes les nervures, tout en conservant une faible vitesse moyenne d'usure globale, ces performances conférant au pneumatique une durée de vie améliorée par rapport au pneumatique de la demande européenne précédemment citée.To simplify, wear becomes more regular but the wear life of the tread is reduced compared to that of a tire whose tread is not provided with inclined incisions. The term wear life means the possible duration of use before complete wear of a tread of a tire while driving, leading either to a tire change or to the renewal of the tread by retreading. There is therefore a need for a tire tread intended to equip the front axle of heavy goods vehicles which does not have (or little) irregular wear and substantially the same wear speed for all the ribs, while retaining low speed average overall wear, these performances giving the tire an improved lifespan compared to the tire of the European application previously mentioned.
Conformément à l'invention, il est proposé une bande de roulement pour pneumatique destiné à équiper l'essieu avant d'un véhicule poids lourd, ce pneumatique comportant une armature de carcasse radiale surmontée d'une armature de sommet, cette bande comprenant des rainures d'orientation générale circonférentielle délimitant au moins trois nervures, deux desdites nervures formant les bords de la bande, certaines des nervures intermédiaires (c'est-à- dire situées entre les nervures bord) étant munies d'une pluralité d'incisions de largeur inférieure à 3 mm, de profondeur E et d'orientation générale transversale et sensiblement parallèles entre elles, ces incisions présentant une inclinaison moyenne non nulle par rapport à la direction perpendiculaire à la surface de roulement de la bande à l'état neuf de sorte que la force résultante exercée en roulage dans la zone de contact avec la chaussée par ladite chaussée sur la bande tende à redresser les incisions vers une inclinaison moyenne nulle par rapport à cette perpendiculaire, cette bande étant caractérisée en ce que, vue dans un plan de coupe perpendiculaire à l'axe de rotation du pneumatique : chaque incision formée sur les nervures intermédiaires fait, sur la surface de roulement à l'état neuf de la bande et au plus sur un tiers de sa profondeur E, un angle au plus égal à 5° avec une perpendiculaire à ladite surface au point d'intersection, chacune de ces incisions faisant avec la même perpendiculaire un angle qui augmente dans l'épaisseur de la bande, les points de ladite incision les plus à l'intérieur dans la bande étant situés, par rapport à ladite perpendiculaire, de manière à être en avant des points de l'incision situés sur la surface de roulement de la bande à l'état neuf.According to the invention, a tread for a tire intended to equip the front axle of a heavy goods vehicle is proposed, this tire comprising a radial carcass reinforcement surmounted by a crown reinforcement, this strip comprising grooves of general circumferential orientation delimiting at least three ribs, two of said ribs forming the edges of the strip, some of the intermediate ribs (that is to say located between the edge ribs) being provided with a plurality of width incisions less than 3 mm, of depth E and of general transverse orientation and substantially parallel to each other, these incisions having a non-zero average inclination relative to the direction perpendicular to the running surface of the strip in the new state so that the resulting force exerted in rolling in the zone of contact with the roadway by said roadway on the strip tends to straighten the incisions towards a zero mean inclination with respect to this perpendicular, this strip being characterized in that, seen in a cutting plane perpendicular to the axis of rotation of the tire: each incision formed on the intermediate ribs makes, on the rolling surface to the new state of the strip and at most over a third of its depth E, an angle at most equal to 5 ° with a perpendicular to said surface at the point of intersection, each of these incisions making with the same perpendicular an angle which increases in the thickness of the strip, the innermost points of said incision in the strip being situated, with respect to said perpendicular, so as to be in front of the points of the incision situated on the rolling surface tape in new condition.
Un point d'une incision situé à l'intérieur de la bande est dit en avant du point de l'incision sur la surface de roulement à l'état neuf quand on doit faire tourner, dans le sens de roulage préconisé, un plan radial (plan contenant l'axe de rotation du pneumatique) passant par le point de l'incision sur la surface de roulement à l'état neuf pour l'amener sur le point de l'incision à l'intérieur de la bande. Par angle voisin de ou égal à 0° avec une perpendiculaire, il faut entendre un angle au maximum égal à 5° (cet angle peut être indifféremment positif ou négatif). L'inclinaison moyenne d'une incision est donnée par l'angle que fait la direction reliant un point de l'incision sur la surface de roulement de la bande et le point le plus à l'intérieur de la bande pris dans un même plan de coupe perpendiculaire à l'axe de rotation.A point of an incision located inside the strip is said in front of the point of the incision on the rolling surface in new condition when it is necessary to rotate, in the direction of travel recommended, a radial plane (plane containing the axis of rotation of the tire) passing through the point of the incision on the rolling surface in new condition to bring it to the point of the incision inside the strip. An angle close to or equal to 0 ° with a perpendicular means an angle at most equal to 5 ° (this angle can be either positive or negative). The average inclination of an incision is given by the angle made by the direction connecting a point of the incision on the running surface of the strip and the innermost point of the strip taken in the same plane. cutting perpendicular to the axis of rotation.
Les pneumatiques selon l'invention sont prévus pour être montés sur l'essieu avant d'un véhicule poids lourd, l'inclinaison moyenne des incisions des nervures étant choisie de façon que les efforts moyens résultants exercés par le sol sur chacune desdites nervures agissent suivant une direction tendant à redresser lesdites incisions et par là les éléments de gomme délimités par ces incisions. Pour permettre une mise en place aisée de pneumatiques selon l'invention sur un véhicule poids lourd, il peut être prévu que chaque pneumatique comprenne un moyen visible indiquant le sens de roulage préférentiel.The tires according to the invention are designed to be mounted on the front axle of a heavy goods vehicle, the mean inclination of the incisions of the ribs being chosen so that the resulting average forces exerted by the ground on each of said ribs act according to a direction tending to straighten said incisions and thereby the rubber elements delimited by these incisions. To allow easy installation of tires according to the invention on a heavy vehicle, it can be provided that each tire comprises a visible means indicating the preferred direction of travel.
En réalisant une variation de l'inclinaison des incisions entre la surface de roulement à l'état neuf et après différents niveaux d'usure de la bande de roulement, il est possible de régler la répartition des efforts moyens résultants sur les différentes nervures tout au long de l'utilisation du pneumatique équipé d'une bande de roulement selon l'invention. En particulier, l'inclinaison supérieure des incisions après une usure partielle de la bande conduit à maintenir le différentiel d'efforts moyens résultants entre les nervures intermédiaires pourvues d'incisions inclinées et les nervures bords sans incision, ce qui est particulièrement favorable après usure partielle de la bande pour éviter de pénaliser les nervures bord en usure.By making a variation in the inclination of the incisions between the rolling surface in new condition and after different levels of wear of the tread, it is possible to adjust the distribution of the resulting average forces on the different ribs while along the use of the tire fitted with a tread according to the invention. In particular, the upper inclination of the incisions after partial wear of the strip leads to maintaining the differential of resulting average forces between the intermediate ribs provided with inclined incisions and the edge ribs without incision, which is particularly favorable after partial wear of the strip to avoid penalizing the ribs edge in wear.
Pour obtenir un effet satisfaisant sur l'usure des nervures bord, il est préférable que les incisions à inclinaison variable dans la profondeur soient disposées sur au moins une des nervures intermédiaires et selon un pas moyen p tel que le rapport k,To obtain a satisfactory effect on the wear of the edge ribs, it is preferable that the incisions with variable inclination in the depth are arranged on at least one of the intermediate ribs and at an average pitch p such that the ratio k,
. Sne p . „ , , . k = satisfasse la relation suivante :. Sne p. „,,. k = satisfy the following relation:
Se HSe H
0.5 < k <4 où Sne est la somme des surfaces des nervures non pourvues d'incisions à inclinaison variable dans l'épaisseur selon l'invention (nervures bord et éventuellement autres nervures intermédiaires),0.5 <k <4 where Sne is the sum of the surfaces of the ribs not provided with incisions with variable inclination in the thickness according to the invention (edge ribs and possibly other intermediate ribs),
Se est la somme des surfaces des nervures pourvues d'incisions à inclinaison variable dans l'épaisseur selon l'invention, et H la profondeur moyenne des rainures longitudinales. Lorsque la valeur de k est inférieure à 0.5, la variation de rigidité des nervures pourvues d'incisions à inclinaison variable dans l'épaisseur par rapport à la rigidité des nervures bord se trouve être trop prononcée et l'effet recherché n'est pas obtenu. De même lorsque la valeur de k est supérieure à 4, la modification de la rigidité des nervures pourvues d'incisions à inclinaison variable dans l'épaisseur n'est pas suffisante pour régler le problème d'usure irrégulière sur les nervures bord.Se is the sum of the surfaces of the ribs provided with incisions with variable inclination in the thickness according to the invention, and H the average depth of the longitudinal grooves. When the value of k is less than 0.5, the variation in stiffness of the ribs provided with incisions with variable inclination in the thickness relative to the stiffness of the edge ribs is found to be too pronounced and the desired effect is not obtained. . Similarly when the value of k is greater than 4, the modification of the rigidity of the ribs provided with incisions with variable inclination in the thickness is not sufficient to solve the problem of irregular wear on the edge ribs.
Préférentiellement, les incisions ont des profondeurs E voisines des profondeurs H des rainures longitudinales de manière à protéger la totalité de la hauteur des nervures bord.Preferably, the incisions have depths E close to the depths H of the longitudinal grooves so as to protect the entire height of the edge ribs.
Préférentiellement, les incisions à inclinaison variable vérifient les valeurs suivantes : - Inclinaison moyenne entre 5° et 15°;Preferably, the incisions with variable inclination check the following values: - Average inclination between 5 ° and 15 °;
Inclinaison en extrémité : 5° à 25°.Tilt at the end: 5 ° to 25 °.
Les incisions à inclinaison variable peuvent présenter une variation d'inclinaison régulière et progressive ou bien une variation selon toute autre forme (par exemple linéaire par morceaux).The incisions with variable inclination can present a variation of regular and progressive inclination or else a variation according to any other form (for example linear by pieces).
D'autres caractéristiques et avantages de l'invention ressortent de la description faite ci-après en référence aux figures annexées qui montrent, à titre d'exemples non limitatifs, des formes de réalisation de l'objet de l'invention.Other characteristics and advantages of the invention emerge from the description given below with reference to the appended figures which show, by way of nonlimiting examples, embodiments of the subject of the invention.
La figure 1 vue en plan d'une partie d'une bande de roulement d'un véhicule poids lourd selon l'invention;Figure 1 plan view of part of a tread of a heavy vehicle according to the invention;
La figure 2 montre une vue en coupe selon la ligne II-II de la bande montrée à la figure 1;Figure 2 shows a sectional view along line II-II of the strip shown in Figure 1;
La figure 3 montre une vue en coupe selon la ligne HI-III de la bande montrée à la figure 1. Sur la figure 1, il est représenté une partie de la surface de roulement S d'une bande de roulement 1 d'un pneumatique selon l'invention et destiné à équiper l'essieu avant d'un véhicule poids lourd. Cette bande de roulement 1 comporte trois rainures principales 2 orientées circonférentiellement, ces trois rainures présentant une profondeur H de 18 mm. Ces rainures 2 délimitent trois nervures intermédiaires 31, 32, 33 et deux nervures bord 30, 34, chaque nervure bord limitant axialement la zone de contact de la bande de roulement avec la chaussée pendant le roulage du pneumatique. Les nervures intermédiaires positionnées entre les nervures bord sont pourvues d'une pluralité d'incisions41, 42, 43 d'inclinaison variable dans l'épaisseur de la bande et traversant de part et d'autre chacune desdites nervures intermédiaires. Ces incisions ont, sur la surface de roulement S, une trace en forme de V dont la pointe est dirigé dans le sens de rotation préférentiel (repéré par la flèche R) du pneumatique pourvu de cette bande de roulement.Figure 3 shows a sectional view along line HI-III of the strip shown in Figure 1. In Figure 1, there is shown a portion of the tread surface S of a tread 1 of a tire according to the invention and intended to equip the front axle of a heavy vehicle. This tread 1 has three main grooves 2 oriented circumferentially, these three grooves having a depth H of 18 mm. These grooves 2 delimit three intermediate ribs 31, 32, 33 and two edge ribs 30, 34, each edge rib axially limiting the area of contact of the tread with the roadway during the rolling of the tire. The intermediate ribs positioned between the edge ribs are provided with a plurality of incisions 41, 42, 43 of variable inclination in the thickness of the strip and passing through each side of said intermediate ribs. These incisions have, on the rolling surface S, a V-shaped trace whose tip is directed in the preferred direction of rotation (indicated by the arrow R) of the tire provided with this tread.
Le pas moyen p entre les incisions d'inclinaison variable dans l'épaisseur de la bande est, dans le cas présenté, constant pour chaque nervure, mais il pourrait être différent selon laThe average pitch p between the incisions of variable inclination in the thickness of the strip is, in the case presented, constant for each rib, but it could be different depending on the
• , . . ^ • - . , . -, .. T i Sne p nervure considérée. Ce pas moyen p est ici égal a 38 mm. Le rapport k = vaut dans•,. . ^ • -. ,. -, .. T i Sne p rib considered. This average pitch p is here equal to 38 mm. The ratio k = is valid in
Se H le cas présent 1 J; la surface non incisée Sne étant proportionnelle à la somme des largeurs des nervures bord 30, 34 égales chacune à 45 mm et la surface incisée Se étant proportionnelle à la somme des largeurs des nervures intermédiaires 31, 32, 33 égale chacune à 35 mm.Se H the present case 1 J; the non-incised surface Sne being proportional to the sum of the widths of the edge ribs 30, 34 each equal to 45 mm and the incised surface Se being proportional to the sum of the widths of the intermediate ribs 31, 32, 33 each equal to 35 mm.
Sur la figure 2, on montre une coupe de la nervure intermédiaire 31 située près de la nervure bord 30, cette coupe étant réalisée selon la ligne II-II de la figure 1 dans un plan peφendiculaire à l'axe de rotation du pneumatique. Sur cette coupe, on distingue des incisions 41 de profondeur totale E légèrement inférieure à la profondeur Η des rainures d'inclinaison variable dans l'épaisseur et présentant une forme curviligne dont l'inclinaison moyenne est égale à 7° (l'inclinaison moyenne de l'incision étant égale à l'angle β que fait, avec une perpendiculaire D à la surface de roulement au point A d'intersection de cette incision avec la surface de roulement, la droite D' située dans le plan de coupe et passant par le point A d'intersection de cette incision avec la surface de roulement et le point B le plus à l'intérieur de la même incision).In Figure 2, there is shown a section of the intermediate rib 31 located near the edge rib 30, this section being made along the line II-II of Figure 1 in a plane peφendicular to the axis of rotation of the tire. In this section, there are incisions 41 of total depth E slightly less than the depth Η of inclination grooves variable in thickness and having a curvilinear shape whose average inclination is equal to 7 ° (the average inclination of the incision being equal to the angle β made, with a perpendicular D to the rolling surface at point A of intersection of this incision with the rolling surface, the straight line D 'situated in the cutting plane and passing through point A of intersection of this incision with the rolling surface and point B the most inside of the same incision).
L'angle α, que fait, dans le plan de la figure 2, la tangente T au tracé de l'incision au point A sur la surface de roulement à l'état neuf avec la peφendiculaire D à la surface de roulement au même point A, est nul dans l'exemple décrit ; cet angle augmente progressivement et régulièrement avec la profondeur pour atteindre 10° au point B le plus à l'intérieur de la bande de roulement (ce point B étant situé à une distance E de la surface de roulement à l'état neuf).The angle α, which, in the plane of Figure 2, makes the tangent T to the line of the incision at point A on the rolling surface in new condition with the perpendicular D to the rolling surface at the same point A, is zero in the example described; this angle increases gradually and regularly with depth to reach 10 ° at the innermost point B of the tread (this point B being located at a distance E from the running surface in new condition).
Sur la figure 3 est montrée une coupe selon la ligne III-III de la nervure centrale 32 de la bande de roulement 1 représentée à la figure 1. Cette nervure centrale comprend une pluralité d'incisions 42 réparties régulièrement dans la direction circonférentielle avec un pas de 38 mm, chacune desdites incisions présentant, vue en coupe, une succession de trois tracés rectilignes, la profondeur totale E de ces incisions étant légèrement inférieure à la profondeur H de chaque rainure 2 (cette dernière profondeur H étant égale à la hauteur de la nervure 32). Le premier tracé 421 est perpendiculaire à la surface de roulement au point Al d'intersection de l'incision avec la surface de roulement et s'étend sur une profondeur sensiblement égale au tiers de la hauteur H de la nervure centrale 32. Le deuxième tracé rectiligne 422 forme un angle ot2 égal à 5° avec le premier tracé 421 et le prolonge sur environ un tiers de la hauteur de la nervure. Le dernier tracé rectiligne 423 forme un angle α3 égal à 5° avec le deuxième tracé 422 et le prolonge sur environ un tiers de la hauteur de la nervure jusqu'au point Bl d'extrémité de l'incision.In Figure 3 is shown a section along line III-III of the central rib 32 of the tread 1 shown in Figure 1. This central rib comprises a plurality of incisions 42 distributed regularly in the circumferential direction with a step 38 mm, each of said incisions having, in section view, a succession of three straight lines, the total depth E of these incisions being slightly less than the depth H of each groove 2 (this last depth H being equal to the height of the rib 32). The first trace 421 is perpendicular to the rolling surface at the point Al of intersection of the incision with the rolling surface and extends over a depth substantially equal to one third of the height H of the central rib 32. The second trace rectilinear 422 forms an angle ot2 equal to 5 ° with the first trace 421 and extends it over approximately a third of the height of the rib. The last rectilinear line 423 forms an angle α3 equal to 5 ° with the second line 422 and extends it over about a third of the height of the rib to the point Bl of the end of the incision.
L'invention n'est pas limitée aux exemples décrits et représentés et diverses modifications peuvent y être apportées sans sortir de son cadre.The invention is not limited to the examples described and shown and various modifications can be made thereto without departing from its scope.
En particulier, les nervures intermédiaires situées directement au voisinage des nervures bord peuvent comporter en plus une pluralité d'incisions ne débouchant que sur leur bord situé du côté desdites nervures bord; ces incisions ayant, comme connu, pour fonction de protéger les nervures intermédiaires d'une usure irrégulière affectant les bords longitudinaux desdites nervures. Ces dernières incisions peuvent suivre le même profil que les incisions d'inclinaison variable dans l'épaisseur et être également d'inclinaison variable.In particular, the intermediate ribs located directly in the vicinity of the edge ribs may further include a plurality of incisions opening only on their edge located on the side of said edge ribs; these incisions having, as known, the function of protecting the intermediate ribs from irregular wear affecting the longitudinal edges of said ribs. These latter incisions can follow the same profile as the incisions of variable inclination in the thickness and also be of variable inclination.
En outre, et sur toutes les nervures, y compris celles du bord, des incisions de faible profondeur devant la profondeur des rainures peuvent être réalisées : ces incisions, de profondeur comprise entre quelques dixièmes de millimètres à deux millimètres n'exercent un rôle que lorsque la bande de roulement est neuve avant de disparaître après usure dans les tous premiers kilomètres de roulage et ne modifient en rien les rigidités de la sculpture de la bande de roulement. In addition, and on all the ribs, including those of the edge, incisions of shallow depth in front of the depth of the grooves can be made: these incisions, of depth between a few tenths of a millimeter to two millimeters only play a role when the tread is new before disappearing after wear in the very first kilometers of driving and does not in any way modify the rigidities of the tread pattern.

Claims

REVENDICATIONS
1 - Bande de roulement (1) pour pneumatique destiné à l'équipement d'un essieu avant d'un véhicule poids lourd, ce pneumatique présentant un sens de roulage préférentiel et comportant une armature de carcasse radiale surmontée d'une armature de sommet, cette bande comprenant des rainures (2) d'orientation générale circonférentielle délimitant au moins trois nervures (30, 31, 32, 33, 34), deux desdites nervures formant les bords (30, 34) de la bande, certaines des nervures intermédiaires (31, 32, 33) étant munies d'une pluralité d'incisions (41, 42, 43) de largeur inférieure à 3 mm, de profondeur E et d'orientation générale transversale et sensiblement parallèles entre elles, ces incisions présentant une inclinaison moyenne non nulle par rapport à la direction perpendiculaire à la surface de roulement (S) de la bande à l'état neuf de sorte que la force résultante exercée en roulage dans la zone de contact avec la chaussée par ladite chaussée sur la bande tende à redresser les incisions vers une inclinaison moyenne nulle par rapport à cette perpendiculaire, cette bande étant caractérisée en ce que, vue dans un plan de coupe peφendiculaire à l'axe de rotation du pneumatique, chaque incision (41, 42, 43) formée sur les nervures intermédiaires (31 , 32, 33) fait, sur la surface de roulement à l'état neuf de la bande et au plus sur un tiers de sa profondeur E, un angle au plus égal à 5° avec une peφendiculaire à ladite surface au point d'intersection, chacune de ces incisions faisant avec la même perpendiculaire un angle qui augmente dans l'épaisseur de la bande, les points de ladite incision les plus à l'intérieur dans la bande étant situés, par rapport à ladite peφendiculaire, de manière à être en avant des points de l'incision situés sur la surface de roulement de la bande à l'état neuf.1 - Tread (1) for a tire intended for equipping a front axle of a heavy goods vehicle, this tire having a preferred direction of rolling and comprising a radial carcass reinforcement surmounted by a crown reinforcement, this strip comprising grooves (2) of general circumferential orientation delimiting at least three ribs (30, 31, 32, 33, 34), two of said ribs forming the edges (30, 34) of the strip, some of the intermediate ribs ( 31, 32, 33) being provided with a plurality of incisions (41, 42, 43) of width less than 3 mm, of depth E and of general transverse orientation and substantially parallel to each other, these incisions having an average inclination not zero with respect to the direction perpendicular to the running surface (S) of the strip in new condition so that the resulting force exerted in rolling in the zone of contact with the roadway by said roadway on the strip ten to straighten the incisions towards a zero mean inclination with respect to this perpendicular, this strip being characterized in that, seen in a plane of section peφendicular to the axis of rotation of the tire, each incision (41, 42, 43) formed on the intermediate ribs (31, 32, 33) made, on the running surface of the strip in new condition and at most over a third of its depth E, an angle at most equal to 5 ° with a peφendicular to said surface at the point of intersection, each of these incisions making with the same perpendicular an angle which increases in the thickness of the strip, the points of said innermost incision in the strip being located, with respect to said peφendicular , so as to be in front of the incision points located on the running surface of the strip in new condition.
2 - Bande de roulement (1) selon la revendication 1 caractérisée en ce que l'inclinaison moyenne des incisions (41, 42, 43) d'inclinaison variable dans l'épaisseur est comprise entre 5° et 15°.2 - Tread (1) according to claim 1 characterized in that the average inclination of the incisions (41, 42, 43) of variable inclination in the thickness is between 5 ° and 15 °.
3 - Bande de roulement (1) selon l'une des revendications 1 ou 2 caractérisée en ce que l'inclinaison d'extrémité au point le plus à l'intérieur de la bande de roulement de chaque incision (41, 42, 43) d'inclinaison variable dans l'épaisseur est comprise entre 5° et 25°. 4 - Bande de roulement (1) selon l'une des revendications 1 à 3 caractérisée en ce que les incisions (41, 42, 43) d'inclinaison variable dans l'épaisseur sont régulièrement réparties dans la direction circonférentielle avec un pas p satisfaisant la relation suivante :3 - Tread (1) according to one of claims 1 or 2 characterized in that the inclination of the end at the innermost point of the tread of each incision (41, 42, 43) variable inclination in the thickness is between 5 ° and 25 °. 4 - Tread (1) according to one of claims 1 to 3 characterized in that the incisions (41, 42, 43) of variable inclination in the thickness are regularly distributed in the circumferential direction with a satisfactory pitch p the following relationship:
0.5 < ^ . ^ <4 Se H0.5 <^. ^ <4 H
où Sne est la somme des surfaces des nervures (30, 34) non pourvues d'incisions à inclinaison variable dans l'épaisseur,where Sne is the sum of the surfaces of the ribs (30, 34) not provided with incisions with variable inclination in the thickness,
Se est la somme des surfaces des nervures (31, 32, 33) pourvues d'incisions (41, 42, 43) à inclinaison variable dans l'épaisseur,Se is the sum of the surfaces of the ribs (31, 32, 33) provided with incisions (41, 42, 43) with variable inclination in the thickness,
Η la profondeur moyenne des rainures longitudinales (2). Η the average depth of the longitudinal grooves (2).
EP01984837A 2001-01-10 2001-12-13 Directional running tread comprising sipes with variable inclination Expired - Lifetime EP1351830B1 (en)

Applications Claiming Priority (3)

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FR0100352 2001-01-10
FR0100352 2001-01-10
PCT/EP2001/014693 WO2002055324A1 (en) 2001-01-10 2001-12-13 Directional running tread comprising sipes with variable inclination

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EP1351830A1 true EP1351830A1 (en) 2003-10-15
EP1351830B1 EP1351830B1 (en) 2006-08-30

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US (1) US7350552B2 (en)
EP (1) EP1351830B1 (en)
JP (1) JP4130362B2 (en)
AT (1) ATE337923T1 (en)
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WO (1) WO2002055324A1 (en)

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DE60122775D1 (en) 2006-10-12
US20040003879A1 (en) 2004-01-08
DE60122775T2 (en) 2007-09-13
WO2002055324A1 (en) 2002-07-18
JP2004523408A (en) 2004-08-05
ATE337923T1 (en) 2006-09-15
US7350552B2 (en) 2008-04-01
EP1351830B1 (en) 2006-08-30
JP4130362B2 (en) 2008-08-06

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